这是一个模拟月亮，太阳及地球运行轨道的project。可以加速，停止，或减速地球的自转速度。也可以查看不同时刻的月相图。-This is a simulation of the moon, the sun, and the project of the Earth' s orbit. Can accelerate, stop or decelerate the speed of the Earth' s rotation. You can also view a different